/* $OpenBSD: ddp_output.c,v 1.2 2000/06/16 21:47:15 provos Exp $ */ /* * Copyright (c) 1990,1991 Regents of The University of Michigan. * All Rights Reserved. * * Permission to use, copy, modify, and distribute this software and * its documentation for any purpose and without fee is hereby granted, * provided that the above copyright notice appears in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation, and that the name of The University * of Michigan not be used in advertising or publicity pertaining to * distribution of the software without specific, written prior * permission. This software is supplied as is without expressed or * implied warranties of any kind. * * Research Systems Unix Group * The University of Michigan * c/o Mike Clark * 535 W. William Street * Ann Arbor, Michigan * +1-313-763-0525 * netatalk@itd.umich.edu */ /* * The following is the contents of the COPYRIGHT file from the * netatalk-1.4a2 distribution, from which this file is derived. */ /* * Copyright (c) 1990,1996 Regents of The University of Michigan. * * All Rights Reserved. * * Permission to use, copy, modify, and distribute this software and * its documentation for any purpose and without fee is hereby granted, * provided that the above copyright notice appears in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation, and that the name of The University * of Michigan not be used in advertising or publicity pertaining to * distribution of the software without specific, written prior * permission. This software is supplied as is without expressed or * implied warranties of any kind. * * This product includes software developed by the University of * California, Berkeley and its contributors. * * Solaris code is encumbered by the following: * * Copyright (C) 1996 by Sun Microsystems Computer Co. * * Permission to use, copy, modify, and distribute this software and * its documentation for any purpose and without fee is hereby * granted, provided that the above copyright notice appear in all * copies and that both that copyright notice and this permission * notice appear in supporting documentation. This software is * provided "as is" without express or implied warranty. * * Research Systems Unix Group * The University of Michigan * c/o Wesley Craig * 535 W. William Street * Ann Arbor, Michigan * +1-313-764-2278 * netatalk@umich.edu */ /* * None of the Solaris code mentioned is included in OpenBSD. * This code also relies heavily on previous effort in FreeBSD and NetBSD. */ #include #include #include #include #include #include #include #include #include #include #undef s_net #include #include #include #include #include #include #include int ddp_output __P(( struct mbuf *, ... )); u_int16_t at_cksum __P(( struct mbuf *, int )); int ddp_route __P((struct mbuf *, struct route * )); int ddp_cksum = 1; int #if __STDC__ ddp_output(struct mbuf *m, ...) #else ddp_output(m, va_alist) struct mbuf *m; va_dcl #endif { struct ddpcb *ddp; struct ddpehdr *deh; va_list ap; va_start(ap, m); ddp = va_arg(ap, struct ddpcb *); va_end(ap); M_PREPEND( m, sizeof( struct ddpehdr ), M_WAIT ); deh = mtod( m, struct ddpehdr *); deh->deh_pad = 0; deh->deh_hops = 0; deh->deh_len = m->m_pkthdr.len; deh->deh_dnet = ddp->ddp_fsat.sat_addr.s_net; deh->deh_dnode = ddp->ddp_fsat.sat_addr.s_node; deh->deh_dport = ddp->ddp_fsat.sat_port; deh->deh_snet = ddp->ddp_lsat.sat_addr.s_net; deh->deh_snode = ddp->ddp_lsat.sat_addr.s_node; deh->deh_sport = ddp->ddp_lsat.sat_port; /* * The checksum calculation is done after all of the other bytes have * been filled in. */ if ( ddp_cksum ) { deh->deh_sum = at_cksum( m, sizeof( int )); } else { deh->deh_sum = 0; } deh->deh_bytes = htonl( deh->deh_bytes ); return( ddp_route( m, &ddp->ddp_route )); } u_int16_t at_cksum( m, skip ) struct mbuf *m; int skip; { u_int8_t *data, *end; u_long cksum = 0; for (; m; m = m->m_next ) { for ( data = mtod( m, u_int8_t * ), end = data + m->m_len; data < end; data++ ) { if ( skip ) { skip--; continue; } cksum = ( cksum + *data ) << 1; if ( cksum & 0x00010000 ) { cksum++; } cksum &= 0x0000ffff; } } if ( cksum == 0 ) { cksum = 0x0000ffff; } return( (u_int16_t)cksum ); } int ddp_route( m, ro ) struct mbuf *m; struct route *ro; { struct sockaddr_at gate; struct elaphdr *elh; struct mbuf *m0; struct at_ifaddr *aa = NULL; struct ifnet *ifp; u_int16_t net; if ( ro->ro_rt && ( ifp = ro->ro_rt->rt_ifp )) { net = satosat( ro->ro_rt->rt_gateway )->sat_addr.s_net; for ( aa = at_ifaddr; aa; aa = aa->aa_next ) { if ( aa->aa_ifp == ifp && ntohs( net ) >= ntohs( aa->aa_firstnet ) && ntohs( net ) <= ntohs( aa->aa_lastnet )) { break; } } } if ( aa == NULL ) { m_freem( m ); return( EINVAL ); } /* * There are several places in the kernel where data is added to * an mbuf without ensuring that the mbuf pointer is aligned. * This is bad for transition routing, since phase 1 and phase 2 * packets end up poorly aligned due to the three byte elap header. */ if ( aa->aa_flags & AFA_PHASE2 ) { if (( m = m_pullup( m, MIN( MHLEN, m->m_pkthdr.len ))) == 0 ) { return( ENOBUFS ); } } else { MGET( m0, M_WAIT, MT_HEADER ); if ( m0 == 0 ) { m_freem( m ); return( ENOBUFS ); } m0->m_next = m; m0->m_len = SZ_ELAPHDR; m = m0; elh = mtod( m, struct elaphdr *); elh->el_snode = satosat( &aa->aa_addr )->sat_addr.s_node; elh->el_type = ELAP_DDPEXTEND; if ( ntohs( satosat( &ro->ro_dst )->sat_addr.s_net ) >= ntohs( aa->aa_firstnet ) && ntohs( satosat( &ro->ro_dst )->sat_addr.s_net ) <= ntohs( aa->aa_lastnet )) { elh->el_dnode = satosat( &ro->ro_dst )->sat_addr.s_node; } else { elh->el_dnode = satosat( ro->ro_rt->rt_gateway )->sat_addr.s_node; } } if ( ntohs( satosat( &ro->ro_dst )->sat_addr.s_net ) >= ntohs( aa->aa_firstnet ) && ntohs( satosat( &ro->ro_dst )->sat_addr.s_net ) <= ntohs( aa->aa_lastnet )) { gate = *satosat( &ro->ro_dst ); } else { gate = *satosat( ro->ro_rt->rt_gateway ); } ro->ro_rt->rt_use++; /* XXX The NULL should be a struct rtentry */ return((*ifp->if_output)( ifp, m, (struct sockaddr *) &gate, NULL )); }